According to the HWinfo utility, the Taichi motherboard is still feeding incorrect power telemetry data to the SMU—the utility lists the deviation at ~7%. However, our measurements align more with our expectations of VRM losses, so the HWinfo data could be a misreport. (It's still unclear exactly how HWinfo determines deviation.)
HWinfo hasn't shared information with us to clarify how it measures deviation, so the tool is a bit of a black box. The HWinfo tool reports a variance of 12% with the auto VDD settings above, implying that the tool makes its decisions based on reference full scale current values, and not those optimized by vendors.
Modern chips rely upon accurate telemetry data, and HWinfo's new deviation feature helps shine a light on how some motherboard vendors have found a way to misreport power telemetry. Unfortunately, the inner workings of the tool aren't entirely clear, and HWinfo doesn't specify how it assigns the deviation value. From our testing, it appears the tool doesn't take what we would consider legitimate adjustments to the full scale current into account, which causes inflated deviation readings.